Correlations between structure and microwave dielectric properties of Co doped MgMoO4 ceramics |
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| Affiliation: | 1. School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xian 710021, Shaanxi, PR China;2. Energy Storage and Distributed Resources Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States;3. Department of Electronic Engineering, School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, PR China;1. College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, PR China;2. Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing Tech University, Nanjing 210009, PR China;3. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, PR China;4. College of Chemistry and Materials Engineering, Changshu Institute of Technology, Changshu 215500, PR China |
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| Abstract: | Mg1-xCoxMoO4 (x = 0.01–0.15) ceramics were prepared by traditional solid-state methods. The phase composition, crystalline structure, micromorphology, and microwave dielectric properties of Mg1-xCoxMoO4 ceramics were comprehensively studied. Mg1-xCoxMoO4 ceramics present monoclinic wolframite structures from x = 0.01 to x = 0.15 with Co occupying the Mg-site. With the addition of Co2+, εr of Mg1-xCoxMoO4 ceramics increase. Q × f is maximal at 5 mol% Co2+ content. The Mg0.95Co0.05MoO4 ceramic exhibits an optimal microwave dielectric property: εr = 7, Q × f = 59247 GHz, τf = −68 ppm/°C. The Q × f values increase by 20% compared with the pure MgMoO4 ceramics (~49149 GHz). Doping Co2+ effectively promotes the densification of ceramics and increases εr and Q × f. However, when the Co content exceeds 5 mol%, the decreased packing fraction and disorder distribution of ions contribute to the increase in dielectric losses. The correlations between Co2+ substitution and wolframite structure have been discussed by Raman spectroscopy, FT-IR spectroscopy and Rietveld refinement. |
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| Keywords: | Disordered distribution Microwave dielectric properties |
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